9 counters, 3 equal groups
9 ÷ 3 = 3
9 ÷ 6 = 3
9 ÷ 3 = 6
6 counters, 2 equal groups
6 ÷ 2 = 3
6 ÷ 3 = 3
6 ÷ 3 = 2
4 counters, 2 equal groups
4 ÷ 4 = 1
4 ÷ 2 = 2
4 ÷ 1 = 3
4 ÷ 2 = 6
20 counters, 5 equal groups
20 ÷ 4 = 5
20 ÷ 5 = 4